Crazy naked man climbs on front of bus while wearing boxer shorts on his head before chasing the barber who captured him on video

A cell phone video of a naked man stopping traffic and climbing onto the front of a public bus while putting his boxers on his head before dismounting and chasing after the man filming him, is raising a few questions:

Who is he? Why is he running around naked? And what did he just inhale or ingest?

The minute and a half-long video, which was shot in November and posted to YouTube just yesterday, contains nudity and profanity and may not suitable for some viewers.

Scroll down to see video

Bizarre behavior: A cell phone video of a naked man stopping traffic and climbing onto the front of a public bus hit YouTube on Thursday.

Crazy? The unidentified man then put his boxers on his head before dismounting and chasing after the man filming him

The video starts with the unidentified naked man clinging to the front of a SEPTA Route 3 bus in Philadelphia stopped at an intersection.

The man then puts his boxer shorts on his head as he flashes the passengers, before stepping off the bumper onto the street.